| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| -9 | Don't know (spontaneous) | 2 | 
                                    
                                    1.6%
                                 | 
| 5 | 5 | 
                                    
                                    4%
                                 | |
| 9 | 1 | 
                                    
                                    0.8%
                                 | |
| 10 | 19 | 
                                    
                                    15.1%
                                 | |
| 12 | 2 | 
                                    
                                    1.6%
                                 | |
| 13 | 1 | 
                                    
                                    0.8%
                                 | |
| 14 | 1 | 
                                    
                                    0.8%
                                 | |
| 15 | 30 | 
                                    
                                    23.8%
                                 | |
| 18 | 1 | 
                                    
                                    0.8%
                                 | |
| 20 | 19 | 
                                    
                                    15.1%
                                 | |
| 22 | 2 | 
                                    
                                    1.6%
                                 | |
| 25 | 13 | 
                                    
                                    10.3%
                                 | |
| 30 | 7 | 
                                    
                                    5.6%
                                 | |
| 35 | 4 | 
                                    
                                    3.2%
                                 | |
| 40 | 3 | 
                                    
                                    2.4%
                                 | |
| 45 | 2 | 
                                    
                                    1.6%
                                 | |
| 50 | 8 | 
                                    
                                    6.3%
                                 | |
| 60 | 1 | 
                                    
                                    0.8%
                                 | |
| 100 | 5 | 
                                    
                                    4%
                                 | |
| Sysmiss | 234 |